OK.
Now if you do the following google searches you will find the answers to your questions in this thread. It should take about 2 minutes to do them all.
Direct reading magnetic compass
Remote magnetic compass
Compass deviation
Compass variation.
You will find that your statement that
Deviation I know for sure
Is incorrect.
PPRUNE members will be happy to help you, but they will expect you to have done a little bit of DIY research/study first.